Cache is not created with mode 0777. Then it's impossible to
delete it.
Code:
Nette/Configurator.php:258
is:
if (!is_dir($dir)) {
mkdir($dir, 0777);
}
It probably should be right:
if (!is_dir($dir)) {
$old = umask(0);
mkdir($dir, 0777);
umask($old);
}